Draw-works brake mechanism



June 29 1926. 1,590,675-

A. H. DAVIS- DRAW WORKS BRAKE MECHANISM Filed April 23, 1923 'JNVENTOR fluf/ier H. liar/IS BY 77M 'fiM/ffia e ATTORNEYS i i Patented done 2%, l ltt wit '5 a c a r o l n a r ltlhlll i let. it r llalrlll r rt;

AUTHEJR; I 1. DAVIS, LONG BEACH, CALIFURNIIL,

DRAlV-NORLKS MECHANISM.

Application filed April 23, less Serial No. 634,019. 7

This invention relates to hoisting drums position by nuts 11 mounted above and be employing a double band brake and is more low the bones on the pins. The brake bands particularly applicable to the draw works are passed around the drums and their other of a. well drilling outfit. The invention is ends are secured to cranks 12 formed in a o herein described and illustrated as embodied lever shalt 1 1, which is journalled in boxes secured to the derrick floor. The lever shaft in rotary drilling. pipe is let down into has a hand lever 15, the lever shafts and the hole by means of the draw Works. After cranks being preferably formed integral. withdrawal of the drill pipe for access to It is obvious that the lever 15 may be swung 10 the drill, the pipe must then again be low so as to tighten the brake bands. The strucered. in the case of holes which are deep ture just described is the usual draw works in a rotary drilling outfit.

the weightof the pipe on. the line causes construction. a heavy strain upon the drum. The brakes become exceedinglv hot, and, 11 too much of suitable means is a bar 16.

drum resulting in material damage to the ally secured to the cross-bar.

this invention is to provide a structure of the pull upon the brake bands. 25 the character just described which may be held the brake bands.

MB and corresponding accomplishments are ob anchor 'is provided.

drawing, in which and Fig. 2 is a perspective view on an enl/Vhat l claim isz larged scale of my improved structure detached from the draw works.

Firmly secured to the derrick floor by any l 'ivotally se the work of braking is taken by one oi the cured at 20 to the end of bar 16 is a cross bands, serious trouble is encountered which bar 17'. At opposite ends of the cross-bar may result in. causing an explosion o the 17 are attachment barslb which are pivot- The brake outfit and tools as well as injury to the bands 10 are provided with holes just above so workers. The primary object of this inventhe pins 9, and the attachment plates are tion is to provide a construction to equally secured thereto lay-means of bolts 1. The distribute the braking between the two brake top nuts 11 of the anchor rods are loosened bands and their drums. Another object of so that the equalizing anchor will not take it is obvious that the pull upon the brake applied to the ordinary draw works so that bands will be equally divided through the in case of breakage the usual anchors will equalizing anchor. lit the anchor or a por-- 7 tion thereo i'f should break, the boxes on pins These objects together with other objects 9 will engage the nuts .11. Thus, a safety llurtherrnore, if the tained by means of the embodiment of my equalizinganchor breaks the operation oi invention illustrated in the accompanying lowering the drill pipe can be concluded by using the brake in the usual manner the rods Fig. 1 is a perspective view of a draw 8 serving to anchor the ends of the band in as works including my improved structurey place.

1. In a draw works, the combination of a hoisting drum provided with a brake hav- Referring more particularly to the ing two brake bands, means secured to the to ing, 3 indicates posts forming a part of the ends of the bands to adjustably pull and derrick and mounted thereon are boxes t tighten the latter, an equalizing anchor so in which is journalled the shaft 5. The ctr-nod to a stationary support and to the usual gears and clutches may be mounted other ends of said bands so as to take any upon the shaft. but as they form no part pull upon the latter, and safety means conof the present invention they are not denected to each brake band ad aCent said arr-- tilt.

scribed. in detail or illustrated. Fixed to char and to a stationary support, said means the shaft is the hoistin drum 6 upon which bein normall looselv secured to said bands b b 1 1. a line is adapted to be wound. At the ends and arranged to chee e and hold the latter of the hoisting drum are brake drums Secured to the derriclr floor are rods or upon their being released from said anchor.

2. In a dr w works; the combination of bolts 8. These rods are arrangedim pairs a hoisting drunn two brake drums arranged and mounted upon each pair so as to be adto rotate with. said hoisting drum two brake justable are pins The ends of the brake hands embracing said drums, means secured bands 10 are secured to pins 9. This is the to the ends of said bands to adjustably pull usual construction, and the pins are held in and tighten the latter safety rods slidingly ill) secured to the other ends of said brakebands thereof and to a stationary support so as whereby said bands may slide about said to relieve said safety rods of normally supdrums for a limited distance and be tightporting' said brake band. 10 ened thereon, across-bar pivotally secured In witness that I claim the foregoing I between the last mentioned ends of said have hereunto snbscribed my name this 16th brake bands, an anchor bar pivotally' seday of April, 1923.

cured to said cross-bar between the ends AUTHER H. DAVIS. 

